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 #include &lt;QtGui&gt;

 #include &quot;svgview.h&quot;
 #include &quot;svgwindow.h&quot;

 SvgWindow::SvgWindow()
     : QScrollArea(),
       highQualityAntialiasing(false)
 {
     QWidget *view = new QWidget(this);
     renderer = SvgWindow::Native;
     setWidget(view);
 }

 void SvgWindow::openFile(const QString &amp;file)
 {
     currentPath = file;
     setRenderer(renderer);
 }

 void SvgWindow::setRenderer(RendererType type)
 {
     renderer = type;
     QWidget *view;

     if (renderer == OpenGL) {
         #ifndef QT_NO_OPENGL
         view = new SvgGLView(currentPath, this);
         qobject_cast&lt;SvgGLView *&gt;(view)-&gt;setHighQualityAntialiasing(highQualityAntialiasing);
         #endif
     } else if (renderer == Image) {
         view = new SvgRasterView(currentPath, this);
     } else {
         view = new SvgNativeView(currentPath, this);
     }

     setWidget(view);
     view-&gt;show();
 }

 void SvgWindow::setHighQualityAntialiasing(bool hq)
 {
     highQualityAntialiasing = hq;

     #ifndef QT_NO_OPENGL
     QWidget *view = widget();
     if (renderer == OpenGL)
         qobject_cast&lt;SvgGLView *&gt;(view)-&gt;setHighQualityAntialiasing(highQualityAntialiasing);
     #endif
 }

 void SvgWindow::mousePressEvent(QMouseEvent *event)
 {
     mousePressPos = event-&gt;pos();
     scrollBarValuesOnMousePress.rx() = horizontalScrollBar()-&gt;value();
     scrollBarValuesOnMousePress.ry() = verticalScrollBar()-&gt;value();
     event-&gt;accept();
 }

 void SvgWindow::mouseMoveEvent(QMouseEvent *event)
 {
     if (mousePressPos.isNull()) {
         event-&gt;ignore();
         return;
     }

     horizontalScrollBar()-&gt;setValue(scrollBarValuesOnMousePress.x() - event-&gt;pos().x() + mousePressPos.x());
     verticalScrollBar()-&gt;setValue(scrollBarValuesOnMousePress.y() - event-&gt;pos().y() + mousePressPos.y());
     horizontalScrollBar()-&gt;update();
     verticalScrollBar()-&gt;update();
     event-&gt;accept();
 }

 void SvgWindow::mouseReleaseEvent(QMouseEvent *event)
 {
     mousePressPos = QPoint();
     event-&gt;accept();
 }</pre>
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